export default {
	namespaced: true,
	state: () => ({
		cart: JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	mutations: {
		addToCart(state, goods) {
			// 查询购物车里有没有这个商品，有就count++，没有就加入goods数组
			const findResult = state.cart.find((x) => x.goods_id === goods.goods_id)
			if (!findResult) {
				state.cart.push(goods)
			} else {
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state) {
			uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		// 更新购物车中商品勾选状态
		updateGoodsState(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_state = goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
		},
		//更新商品数量（购物车）持久化
		updateGoodsCount(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_count = goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		//根据id删除购物车中对应的商品
		removeGoodsById(state, goods_id) {
			state.cart = state.cart.filter(x => x.goods_id !== goods_id)
			this.commit('m_cart/saveToStorage')
		},
		// 全选和反选
		updateAllGoodsState(state, newState) {
			state.cart.forEach(x => x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		}
	},
	getters: {
		total(state) {
			// let c =0
			// 	state.cart.forEach(x=>c+=x.goods_count)
			// 	return c
			return state.cart.reduce((total, item) => total += item.goods_count, 0)
		},
		// 选中的商品数量
		checkedCount(state) {
			// 过滤出已勾选的，然后累加
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
		},
		//动态计算勾选的商品的总价
		checkedGoodsAmount(state){
			return state.cart.
			filter(x=>x.goods_state).
			reduce((total,item)=>total+=item.goods_price*item.goods_count,0).
			toFixed(2)
		}

	}
}
